SPI Mode 0 Timing
Serial Peripheral Interface (SPI) buses drive communication between microcontrollers and peripherals like sensors or flash memory. Mode 0 is the most prevalent timing scheme: the clock idles low, data is sampled on the leading rising edge, and data transitions on the trailing falling edge.
Construct the core timing elements for an SPI Mode 0 transceiver. The received data bit rx_data must capture the state of miso precisely on the rising edge of sck. The transmit line mosi must update to the value of tx_data precisely on the falling edge of sck.
| Event | rx_data | mosi | |-------|-----------|--------| | sck Rising Edge | miso | No change | | sck Falling Edge | No change | tx_data |
Constraints
- Use edge-triggered flip-flops for both capture and update operations.
- The
rx_dataoutput must only change state exactly on the rising edge ofsck. - The
mosioutput must only change state exactly on the falling edge ofsck.
Topics
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